chromeos: Converts WorkspaceLayoutManager to aura::LayoutManager

ash/wm/workspace/workspace_layout_manager_unittest.cc

Index: ash/wm/workspace/workspace_layout_manager_unittest.cc
diff --git a/ash/wm/workspace/workspace_layout_manager_unittest.cc b/ash/wm/workspace/workspace_layout_manager_unittest.cc
index e6309ef4be672bafe0a9703a6ac7110cc9fc42b6..5ef8fe99d7b78012986b67cb051f4a26b1ca65db 100644
--- a/ash/wm/workspace/workspace_layout_manager_unittest.cc
+++ b/ash/wm/workspace/workspace_layout_manager_unittest.cc
@@ -730,8 +730,7 @@ TEST_F(WorkspaceLayoutManagerSoloTest, FullscreenSuspendsAlwaysOnTop) {
       always_on_top_window1->GetProperty(aura::client::kAlwaysOnTopKey));
   EXPECT_FALSE(
       always_on_top_window2->GetProperty(aura::client::kAlwaysOnTopKey));
-  EXPECT_NE(nullptr, wm::GetWindowForFullscreenMode(
-                         WmWindow::Get(fullscreen_window.get())));
+  EXPECT_NE(nullptr, wm::GetWindowForFullscreenMode(fullscreen_window.get()));
 
   // Adding a new always-on-top window is not affected by fullscreen.
   std::unique_ptr<aura::Window> always_on_top_window3(
@@ -749,8 +748,7 @@ TEST_F(WorkspaceLayoutManagerSoloTest, FullscreenSuspendsAlwaysOnTop) {
       always_on_top_window2->GetProperty(aura::client::kAlwaysOnTopKey));
   EXPECT_TRUE(
       always_on_top_window3->GetProperty(aura::client::kAlwaysOnTopKey));
-  EXPECT_EQ(nullptr, wm::GetWindowForFullscreenMode(
-                         WmWindow::Get(fullscreen_window.get())));
+  EXPECT_EQ(nullptr, wm::GetWindowForFullscreenMode(fullscreen_window.get()));
 }
 
 // Similary, pinned window causes always_on_top_ windows to stack below.
@@ -933,8 +931,7 @@ TEST_F(WorkspaceLayoutManagerSoloTest, NotResizeWhenScreenIsLocked) {
 namespace {
 
 WorkspaceLayoutManager* GetWorkspaceLayoutManager(aura::Window* container) {
-  return static_cast<WorkspaceLayoutManager*>(
-      WmWindow::Get(container)->GetLayoutManager());
+  return static_cast<WorkspaceLayoutManager*>(container->layout_manager());
 }
 
 class WorkspaceLayoutManagerBackdropTest : public test::AshTestBase {